Venous return refers to which of the following?

Venous return refers to which of the following?

• A. The volume of blood returned to the heart, determining the end-diastolic volume.
• B. The amount of blood pumped into the aorta per beat.
• C. The pressure in the left ventricle during systole.
• D. The rate of venous blood flow through the veins.

Answer: (A)

Venous return refers to the volume of blood returning to the heart per minute, which fills the ventricles during diastole and sets the end-diastolic volume. This preload determines how stretched the heart muscle is before it contracts. The more blood that returns, the greater the EDV, and the stronger the next contraction tends to be via the Frank-Starling mechanism, increasing stroke volume and, in steady conditions, cardiac output. It’s not describing the amount pumped into the aorta per beat (that’s stroke volume), nor the pressure in the ventricle during systole, nor the rate of venous flow alone. Venous return is influenced by the venous pressure gradient, blood volume, venous tone, posture, and pumps that help push blood back to the heart.

Venous return refers to the volume of blood returning to the heart per minute, which fills the ventricles during diastole and sets the end-diastolic volume. This preload determines how stretched the heart muscle is before it contracts. The more blood that returns, the greater the EDV, and the stronger the next contraction tends to be via the Frank-Starling mechanism, increasing stroke volume and, in steady conditions, cardiac output. It’s not describing the amount pumped into the aorta per beat (that’s stroke volume), nor the pressure in the ventricle during systole, nor the rate of venous flow alone. Venous return is influenced by the venous pressure gradient, blood volume, venous tone, posture, and pumps that help push blood back to the heart.